| Component: (Network and Table) | |
|---|---|
| Network | 8267 - Disclosure - Defined Benefit Plans, Funded Status (Level 4 Detail) (http://www.xbrlsite.com/nfp/role/level4/DefinedBenefitPlansFundingStatus) |
| Table | Defined Benefit Plans Funded Status Roll Up [Table] |
| Reporting Entity [Axis] | 63-0977897 (https://www.irs.gov#EIN) |
| Benefit Plans [Axis] | Defined Benefit Pension Plans [Member] |
| Defined Benefit Plans Funded Status Roll Up [Line Items] | Period [Axis] | ||
|---|---|---|---|
2020-12-31 | 2019-12-31 | 2018-12-31 | |